docs: replace ASCII diagram with SVG for saas_runtime_mode

Co-authored-by: openhands <openhands@all-hands.dev>

Author: jpshackelford

sdk/guides/agent-server/images/saas-runtime-mode.svg

@@ -114,23 +114,9 @@ For advanced orchestration, you may want to run SDK scripts *inside* a Cloud san
 
 This uses `saas_runtime_mode=True`. See [SaaS Runtime Mode](/sdk/guides/agent-server/cloud-workspace#saas-runtime-mode) for the full pattern.
 
-```
-┌─────────────────────────────────────────────────────────────┐
-│  Your Orchestrator (CI, scheduler, or parent agent)        │
-│  └── Creates sandbox, uploads script, triggers execution   │
-└─────────────────────────────────────────────────────────────┘
-                              │
-                              ▼
-┌─────────────────────────────────────────────────────────────┐
-│  OpenHands Cloud Sandbox                                    │
-│  ┌───────────────────────────────────────────────────────┐  │
-│  │  Your SDK script (saas_runtime_mode=True)             │  │
-│  │  └── Connects to local agent-server                   │  │
-│  │  └── Inherits LLM/secrets from Cloud account          │  │
-│  │  └── Sends callback on completion                     │  │
-│  └───────────────────────────────────────────────────────┘  │
-└─────────────────────────────────────────────────────────────┘
-```
+<Frame>
+  <img src="/sdk/guides/agent-server/images/saas-runtime-mode.svg" alt="SaaS Runtime Mode orchestration pattern" />
+</Frame>
 
 ### Enterprise: Self-Managed Infrastructure